Polyalkylene glycol polyphosphorus compounds

ABSTRACT

1. A POLYPHOSPHORUS COMPOSITION CHARACTERIZED BY AN OH NUMBER BELOW ABOUT 160, AND HAVING THE FORMULA:   HO-R-O-(P(=O)(-R&#39;&#39;)-O-R-O)N-(P(-O-R1)-O-R-O)M-H   WHEREIN R IS POLYALKYLENE GLYCOL RESIDUE DEFINED AS THAT PORTION REMAINING AFTER TWO HYDROXYL GROUPS HAVE BEEN REMOVED FROM A GLYCOL HAVING THE FORMULA: HO-(R&#34;-O)X-H WHEREIN R IS AN ALKYLENE GROUP OF FROM 2 TO ABOUT 20 CARBON ATOMS, WHICH IS STRAIGHT CHAIN, BRANCH CHAIN, OR A MIXTURE THEREOF, AND X DESIGNATES THE NUMBER OF REPEATING ALKYLENE ETHER UNITS AND IS FROM 2 TO ABOUT 20; R1 IS A C1-C10 ALKYL RESIDUE; R&#39;&#39; IS AN ALLYLIC RESIDUE FORMED FROM A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALLYL BROMIDE, ALLYL CHLORIDE, 3,4-DICHLOROBUTENE-2; M IS A NUMTRICHLOROPROPENE AND 1,4-DICHLOROBUTENE-2; M IS A NUMBER IN THE RANGE FROM 0 TO ABOUT 25; AND N IS A MUMBER IN THE RANGE FROM 1 TO ABOUT 25 WITH THE PROVISO THAT THE SUM OF M+N IS IN THE RANGE OF FROM ABOUT 2 TO ABOUT 50.

United States Patent 3,840,622 POLYALKYLENE GLYCOL POLYPHOSPHORUS COMPOUNDS Kyung Sup Shim, Irvington, N.Y., assignor to Staulfer Chemical Company, New York, N.Y. No Drawing. Filed Nov. 11, 1971, Ser. No. 198,006 Int. Cl. C07f 9/08; C08g 22/44 U.S. Cl. 260-929 6 Claims ABSTRACT OF THE DISCLOSURE Polyalkylene glycol polyphosphorous compounds having allylic group or aromatic methylene group phosphonate linkages or both phosphite and allylic group or aromatic methylene group phosphonate linkages are provided by reacting certain polyalkylene glycol polyphosphites with a stoichometric or less than a stoichiometric amount of an allylic group containing halide or halomethylated aromatic compound.

BACKGROUND OF THE INVENTION This invention relates to certain polyalkylene glycol polyphosphorus compounds and more particularly to polyalkylene glycol polyphosphorus compounds having allylic group or aromatic methylene group phosphonate linkages which are useful as flame retardants.

In the polyurethane field, increased interest is being shown in compounds which can be added to the polyurethane polymers to act as fire retardant agents. Particular interest is being shown in compounds which have functional groups reactive with the polyol or polyisocyanate used in preparing the polyurethane so that the fire retardant agent can be copolymerized into the polymer chain. One such group of reactive flame retardants are the polyalkylene glycol phosphites such as those described in U.S. Pat. No. 3,009,939. However, these materials, due to their high OH numbers and crosslinking tendency, are unsuitable for use in flexible urethane foams. In U.S. Pats. 3,081,331 and 3,142,651 there is disclosed a method of forming polyalkylene glycol polyphosphites having up to 10 phosphite groups in the polymer chain by reacting a trialkyl phosphite with a polypropylene glycol in a molar ratio of 2.1 to 2.5 moles of glycol per mode of phosphite. These materials are also unsuitable for use in flexible urethane foams as a result of their high OH numbers and their tendecy to crosslink.

Another attempt at employing reactive flame retardants, described in U.S. Pats. 3,142,651 and 3,092,651, involves the use of polypropylene glycol poly-hydrogenphosphonates produced by a thermal polymerization. Likewise, polyalkylene glycol hydrogen polyphosphonates have also been produced by transesterifying a secondary hydrogen phosphonate with a polyalkylene glycol according to the procedure outlined in British Pat. Nos. 796,446 and 1,011,118. However, many of these materials have relatively high acidity, causing them to react with and thereby deactivate certain catalyst systems generally used in the formation of polyurethane polymers such, for example, as tertiary amine compounds. The first method has the additional drawback of contamination of the product by the alkylene glycol by-product which contamination is not easily removed.

In order to increase the flame retardancy of some of the above described phosphorous compounds, which have low phosphorous content, the prior art has attempted to incorporate various halogen containing substituents into the above described molecules. Thus, U.S. Pat. 3,159,605 describes the reaction of halogenated methanes with these compounds. Likewise, U.S. Pats. 3,131,206 and 3,328,493 describe the reaction of chloral with them. However,

these materials, like their precursors, have many drawbacks. In particular, these products have high OH numbers and low phosphorus content thereby rendering them unsuitable as flame retardants in flexible urethane foams.

In co-pending U.S. applications Ser. No. 86,313, filed Nov. 2, 1970 and Ser. No. 63,262, filed Aug. 6, 1970 by Kyung Sup Shim, there are disclosed novel polyalkylene glycol vinyl phosphates which are far superior as flame retardants for urethane foams, particularly flexible foam, than any of the above described retardants. These vinyl phosphates, however, have one drawback. While they yield foams having excellent flame retardance and physical characteristics, they tend to discolor the center of the bun, thereby rendering the foam objectionable in appearance.

SUMMARY OF THE INVENTION Accordingly, it is one object of the present invention to provide novel polyalkylene glycol polyphosphorus compounds suitable as flame retardants.

Another object of this invention is to provide polyalkylene glycol polyphosphorus compounds suitable as flame retardants for urethane foams, and in particular, for flexible urethane foams.

A further object of the present invention is to prepare polyalkylene glycol polyphosphorous compounds which exhibit superior flame retardancy and physical properties such as stability, in comparison with the prior art compounds and further yield foams having good color and appearance throughout.

A still further object of the present invention is to provide urethane foams having incorporated therein these novel polyalkylene glycol polyphosphorous compounds.

These and other objects are accomplished herein by providing polyalkylene glycol polyphosphorous compounds having allylic group or aromatic methylene group phosphonate linkages or both phosphite and allylic group or aromatic methylene group phosphonate linkages.

DESCRIPTION OF THE PREFERRED EMBODIMENTS or aromatic methylene group phosphonate linkages along the polymer chain. These polyphosphorus polymers are characterized by low OH numbers and low acidity, a lack of the tendency to gel initially or crosslink in the final foamed product, and a high stability during and subsequent to the foam forming process.

The polyphosphorus compounds of the present invention can be represented by an idealized formula as wherein R is a polyalkylene glycol residue; R is an alkyl residue from the tertiary phosphite used to produce the polyalkylene glycol alkyl polyphosphite starting material of the present invention to be discussed hereinafter; R is an allylic residue or aromatic methylene residue to be discussed hereinafter; m is a number in the range between from 0 to about '25 and n is a number in the range between from 1 to about 25 such that the sum of m -i-n is from about 2 to about 50 and preferably between about 4 to about 10. The term alkyl residue as designated by R is preferably C -C alkyl and most preferably methyl or ethyl. The term polyalkylene glycol residue, designated by R, is meant to define that portion remaining after two hydroxyl groups have been removed from a glycol having the formula:

formula as follows:

w HOROI-OR wherein R, R m and n are as defined above. This polyphosphite of Formula III in turn, is formed by transesterifying a tertiary phosphite with a polyalkylene glycol in a molar ratio of from about 1 to about 1.5 and preferably from 1 to 1.2 moles of phosphite per mole of glycol.

The tertiary phosphite used to prepare the polyalkylene glycol alkyl polyphosphite starting material of formula III has the general formula:

(III) R (IV) wherein each R is as defined above. Suitable phosphites include for example, tri-methyl phosphite, triethyl phosphite, tripropyl phosphite, tributyl phosphite, trioctyl phosphite, dimethyl ethyl phosphite, diethyl methyl phosphite and the like. Trimethyl and triethyl phosphite art particularly preferred, with trimethyl phosphite being most preferred.

As stated above, the tertiary phosphite of Formula IV above is transesterified with a glycol corresponding to Formula II above to yield the starting polyalkylene glycol alkyl polyphosphite of Formula III. Illustrative of the glycols which can be employed in the present invention include the following: diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, tributylene glycol, polyethylene glycols wherein the average number of ether units is 2, polypropylene glycols wherein the average number of ether units is 14, trihexylene glycol, and the like. Particular preferred glycols are triethylene glycol, dipropylene glycol and tripropylene glycol. It is understood that these propylene glycols can be primary, secondary, or mixtures thereof.

In order to form the polyphosphite starting materials of the present invention represented by Formula III the tertiary phosphite and the desired glycol must be reacted in critical proportions. Thus, the tertiary phosphite should be present in an amount from about 1 to about 1.5 moles per mole of glycol. The preferred range for this preparation is from about 1 to about 1.2 moles of phosphite per mole of glycol. If the glycol is reacted in quantities greater than 1:1 with the phosphite, the product will contain primarily the undesirable mono, ditri and tetraphosphites and, more importantly, will have a substantial amount of free hydroxyl groups attached to the phosphite group.

The above disclosed transesterification reaction is normally conducted by mixing the phosphite and glycol in the presence of any of the well known transesterification catalysts. Particularly useful catalysts are the alkali metal alcoholates and phenolates such as sodium' methylate, sodium decylate, sodium phenolate, tertiary alkylamine, and the like. These catalysts are normally employed in an amount from about 0.01 to about 10 percent, by weight, of the entire reactant mixture. The reaction temperature should initially be kept below the boiling point of the lowest boiling reactant in order to avoid the loss of that reactant. Although the reaction can be conducted at room temperature, i.e., 2 0 C., it is preferred to conduct it as close to the upper limit as possible in order to increase the rate of reaction. Thus, in the case where trimethyl phosphite is employed as the tertiary phosphite, the reaction temperature is preferably within the range of C. to C. and should not be allowed to rise above C. until at least one R group on each of the phosphite molecules has been replaced with a polyalkylene glycol. This can normally be determined by monitoring the amount of methanol which has been evolved.

While the reaction can be run to completion at these temperature ranges, it has been found to be advantageous to raise the temperature after this initial replacement of one of the R groups on the starting phosphite up to a limit of about 200 C. and most preferably up to about C. As stated above, the point at which the temperature should be raised can be determined by monitoring the amount of by-product alkanol produced. Thus, when one mole of trimethyl phosphite is being transesterified, the reaction temperature can be raised after one mole of methanol has been evolved. The transesterification is completed when two moles of methanol have been evolved. The degree of polymerization of the polyphosphite can be controlled to an extent by varying the time of the reaction. Furthermore, the polymer length can be monitored by measuring the viscosity buildup during the reaction according to well known techniques.

The transesterification reaction can optionally be carried out in the presence of an inert solvent, however, such solvent is not required for the practice of the present invention. The term inert solvent is meant to designate any solvent which does not react with the starting materials or products of the present invention. Suitable solvents include the alkylated benzenes such as ethyl benzene, diethyl benzene, toluene, the xylenes, and the like.

The polyphosphite of Formula III produced by the process described above is then reacted with a stoichiometric (or excess) or less than a stoichiometric amount of an organic compound containing an u-halo-fl-ethylenic unsaturated group. Compounds of this nature which are encompassed within the scope of this invention correspond to the following formulae V and VI:

wherein X is halogen, such as chlorine and bromine, R R R R and R are the same or different and are hydrogen, halogen, alkyl, halo-alkyl, aryl, halo-aryl, aralkyl, or halo-aralkyl and wherein R and R also may form a cyclic ring of up to 4 carbons; and

I Rs (VI) wherein R R and X are as defined above and R is aryl, such as phenyl, naphthyl and the like, halo-aryl and alkyl-aryl. R R R R and R are preferably hydrogen or C -C lower alkyl or halo C -C lower alkyl.

The compounds within the scope of Formula V above are further defined herein as allylic group containing halide compounds While the compounds within the scope of Formula VI are defined herein as halo-methylated aromatic compounds. Accordingly, the terms allytic residue and aromatic methylene residue as employed in Formula I above to described R are meant to be that portion of Formula V and Formula VI remaining after the removal of X. Thus, when R is an allylic residue, the polyphos phorus compounds of the present invention correspond to the following formula:

wherein R, R R R R R and m and n are as defined above. When R is an aromatic methylene residue the polyphosphorus compounds of the present invention correspond to the following formula:

l h (VIII) wherein R, R R R R and m and n are as defined above.

It will be understood that when difunctional allylic halide group compounds encompassed within Formula V, such as 1,4-dichlorobutene-2, are employed, the final prodnot will be crosslinked to a certain degree.

Further illustrative compounds within the scope of Formula V include for example, allyl chloride, allyl bromide, 3,4-dichlorobutene-1, 1,2,3-trichloropropene and the like. Allyl chloride and allyl bromide are particularly preferred. Compounds within the scope of Formula VI include for example, benzyl chloride, benzyl bromide, chloromethylnaphthalene, and the like.

The allylic halide compounds of Formula V and the halomethylated aromatic compounds of Formula VI above are reacted with the polyphosphites of Formula HI above in either stoichiometric or less than stoichiometric amounts. The term stoichiometric amount as used herein, is meant to designate the molar equivalent of phosphite groups in the polyphosphite. Thus, by employing less than this amount, the product will contain unreacted phosphite groups and correspond to compounds Within Formula I above wherein m is 1 or more and n is as defined above. By employing a stoichiometric amount, or excess of an allylic halide or halo-methylated aromatic compound, compounds corresponding to Formula I wherein m is 0 and n is as defined above are produced. Accordingly, if the products resulting from the utilization of less than a stoichiometric amount of halide are desired, any amount of halide less than a stoichiometric amount may be employed. Generally, the desired range for most foam applications of the final product is from about 0.1 to about 0.9 moles of halide compound per mole of phosphite group. On the other hand, if the products resulting from the use of a stoichiometric amount or excess of halide are desired, any substantially stoichiometric or excess quantity of halide may be utilized.

The allylic halide or halomethylated aromatic compound can be reacted with the polyphosphite over a wide temperature range. Normally temperatures from about 50 to about 200 C. are employed. The reaction can be monitored by determining the amount of alkyl halide by-product formed. Thus, when 0.6 molar equivalents or 1.0 molar equivalents of allylic halide compound or halomethylated aromatic compound are used, the reaction is completed when 0.6 moles or 1.0 moles, respectively, of alkyl halide have evolved.

Since the reaction with the allylic halide or halomethylated aromatic compound and the polyphosphite of the present invention is normally endothermic in nature, said reaction is generally performed without the aid of a solvent or diluent as a temperature controlling measure. However, if the use of a solvent or diluent is desired, it should be non-reactive with respect to both the starting materials and desired products and should be miscible therewith. Illustrative of suitable solvents are halobenzenes, such as dichlorobenzene, xylene, ethylbenzcne diethylbenzene, various alkanes and the like.

The novel compounds of the present invention are characterized by their ability to copolymerize with polyisocyanates employed in forming polyurethanes, by their relatively low OH numbers and acidity, by their high phosphorus content, and by their high flame retardancy and stabilizing characteristics in the final foams. These compounds can completely replace the polyols normally employed in forming the foams or they can be used in combination with the polyols, thereby yielding foams with greatly improved flame resistance. Since they react in the foam forming process, their residues are chemically bonded into the foam, thereby giving them high permanance, even upon high temperature aging. The acid numbers of the compounds of the present invention are normaly below about 2 milligrams of KOH per gram of the polyalkylene glycol polyphosphorus compound. This low acidity makes these compounds relatively unreactive toward the polymerization catalysts employed in produc ing the polyurethane foams. As mentioned above, these compounds have relatively low OH numbers as compared to the prior art flame retardants and therefore, can be used in flexible urethane foams without materially affecting the physical properties of such foams. By the term relatively low OH numbers, it is meant to designate OH numbers below about and preferably below 100.

The compounds of the present invention are further characterized by the fact that they are substantially linear polymers when compared to those disclosed in the prior art. This result, at least in part is from the fact that the intermediate polyalkylene glycol alkyl polyphosphites used to make the present compounds contain primarily alkyl side chains attached to the phosphite groups. Consequently, the labile halogen released by the attacking allylic halide or halomethylated aromatic compound will preferentially react with the alkyl side chain rather than with the glycol linking groups. Thus, it has been observed that the by-product formed by the addition of the allylic halide or halomethylated aromatic compound to the polyphosphite intermediates used herein is the alkyl halide rather than the halogenated polyether alcohol which would result from attack on the glycol. Since the phosphite alkyl group is attacked preferentially there is little or no depolymerization.

An additional advantage inherent in the present invention is the fact that the alkyl halide by-product can easily be separated from the desired final product whereas a halogenated polyether alcohol by-product, such as would be formed when using the polymers described in the prior art cannot be easily separated due to its higher boiling point. Furthermore, the necessity for separating a halogenated polyether alcohol by-product is manifest since it is a monofunctional alcohol which would seriously impair, if not destroy, the foam forming ability of the urethane foam mix.

The compounds of the present invention, when employed in sufficient quantity, will yield a self-extinguishing polyurethane foam. This characteristic is particularly important in the area of flexible foams due to the wide use of such foams in hospitals, homes and automobiles. Normally, the compounds of the present invention can be employed in amounts of from about 5 to about 30 percent, by weight, of the entire foam forming mixture to yield self-extinguishing flexible foams. Preferably, they are employed in amounts from 10 to 15 percent, by weight, of the entire mixture. It is understood, however, that this amount will vary depending upon the particular foam being used, and that the required proportions can easily be determined with a minimum amount of blending work.

While the polyphosphorus compounds of the present invention are primarily intended for use in urethane foams, it is contemplated that they can also be used in a wide variety of polymeric systems. Illustrative of these systems are: polyesters, polyolefins, cellulose ethers and esters, urethane coatings and elastomers, polymethyl methacrylates, polyvinyl chlorides, and many others. Furthermore, the compounds of the present invention can also be employed in combination with any of the known flame retardants in foams or polymeric systems.

The polyurethane foams within which the flame retardants described above are incorporated are well known in the art. They are produced by the reaction of a dior polyisocyanate and a dior polyhydroxy (polyol) compound in the presence of a blowing agent and a catalyst. The foams can be made by any of the basic techniques used in foam formation; i.e., the prepolymer technique, the semi-prepolymer technique or the one-shot process. These techniques are well known and described in the polyurethane art.

As examples of organic diand polyisocyanates which can be employed to make the polyurethane foams there can be employed toluene-2,4-diisocyanate, toluene-2,6-diisocyanate; 4-methoxy-l,3-phenylene diisocyanate; diphenyl methane-4,4'-diisocyanate; 4-chloro-l,3-phenylenediisocyanate; 4-isopropyl-1,3-phenylene-diisocyanate; 4- ethoxy-1,3-phenylene-diisocyanate; 2,4 diisocyanate-diphenylether; 3,3'-dimethyl 4,4 diisocyanate-o-diphenyl methane; mesitylene diisocyanate; durylene diisocyanate; 4,4'-dimethylene-bis(phenylisocyanate); benzidine diisocyanate; o-nitrobenzidine diisocyanate; 4,4-diisocyanatedibenzyl; 3,3 bitolylene 4,4 diisocyanate; 1,5-naphthalene diisocyanate; tetramethylene diisocyanate; hexamethylene diisocyanate; decamethylene diisocyanate; toluene-2,4,6-triisocyanate; tritolylmethane triisocyanate; 2,4,4'-triisocyanatodiphenyl ether; the reaction product of toluene diisocyanate with trimethylolpropane; and the reaction product of toluene diisocyanate with 1,2,6-hexanetriol.

Alternatively, as the polyisocyanate there can be used prepolymers made by reacting one or more of the above polyisocyanates with a dior polyhydroxy compound such as a polyester having terminal hydroxyl groups, a polyhydric alcohol, glycerides or hydroxy containing glycerides, etc. These prepolymers should have terminal isocyanate groups and, to insure their presence, it is frequently desirable to employ an excess of 5% or more of the polyisocyanate in forming the prepolymer. Typical examples of such prepolymers having isocyanate end groups are those formed from toluene diisocyanate and polyhydroxy compounds. In most cases, a mixture of 80% of the 2,4-isomer and 20% of the 2,6-isomer of toluene diisocyanate is employed in making these prepolymers. Thus, there can be used the prepolymers resulting from the reaction between toluene diisocyanate and caster oil, blown tung oil, blown linseed oil or blown soya oil, and of toluene diisocyanate and the polyester of ethylene glycol, propylene glycol and adipic acid.

Examples of suitable polyols are polyethylene glycol, polypropylene glycols, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,4-butanediol, thiodiglycol, glycerol, trimethylolethane, trimethylol propane, ether triols from glycerine and propylene oxide, other containing triols from 1,2,6-hexanetriol and propylene oxide, sorbitol-propylene oxide adducts, pentaerythritol-propylene oxide adducts, trimethylol phenol, oxypropylated sucrose, triethanolamine, pentaerythritol, diethanolamine, castor oil, blown linseed oil, blown soya oil, N,N,N,N-tetrakis(2- hydroxyethyl) ethylenediamine, N,N,N,N'-tetrakis(2-hydroxypropyl)ethylenediamine, N,N,N',N",N"pentakis(2- hydroxypropyl) diethyl triamine, N,N,N',N",N"-pentakis(2-hydroxyethyl) diethylene triamine, mixed ethylene glycol-propylene glycol adipate resin, polyethylene adipate phthalate and polyneopentylene sebacate.

In preparing the foamed polyurethanes there can be used any of the conventional basic catalysts such, for

example, as N-methyl morpholine, N-ethyl morpholine, 1,2,4-trimethylpiperazine, trimethyl amine, triethyl amine, tributyl amine and other trialkyl amines, the esterification product of adipic acid and diethylethanolamine, triethyl amine citrate, 3-morpholinopropionamide, 1,4-bis(2-hydroxypropyl) 2 methylpiperazine, Z-diethylaminoacetamide, 3-diethylaminopropionamide, diethylethanolamine, triethylenediamine, N,N,N,N'-tetrakis 2-hydroxypropyl) ethylenediamine, N,N'-dimethylpiperazine, N,N-dimethylhexahydroaniline, tribenzylamine and sodium phenolate. Also applicable are tin compounds, e.g., hydrocarbon tin acrylates such as dibutyltin dilaurate, dibutyltin diacetate, dibutyltin dioctoate, tributyltin monolaurate, dimethyltin diacetate, dioctyltin diacetate, dilauryltin diacetate, dibutyltin maleate, hydrocarbon tin alkoxides, e.g., dibutyltin diethoxide, dibutyltin dimethoxide, diethyltin dibutoxide as well as other tin compounds, e.g., octylstannoic acid, trimethyltin hydroxide, trimethyltin chloride, triphenyltin hydroxide, trimethyltin chloride, triphenyltin hydride, triallyltin chloride, trioctyltin fluoride, dibutyltin dibromide, bis(carboethoxymethyl) tin diiodide, tributyltin chloride, trioctyltin acetate, butyltin trichloride, octyltin tris(thiobutoxide), dimethyltin oxide, dibutyl tin oxide, dioctyltin oxide, diphenyltin oxide, stannous octanoate, and stannous oleate.

Any of the conventional surfactants can be used in amounts of 1% or less, e.g. 0.2% by weight of the composition. The preferred surfactants are silicones, e.g., polydimethyl siloxane having a viscosity of 3 to centistokes, triethoxydimethyl polysiloxane, molecular weight 850 copolymehized with a dimethoxpyolyethylene glycol having a molecular weight of 750.

The foaming reaction can be carried out by adding water to the polyol prior to or simultaneously with the addition of the polyisocyanate. Alternatively, foams can be prepared by the use of a foaming or blowing agent. These are usually a liquefied, halogen substituted alkane such, for example, as methylene chloride. Especially preferred are those halogen substituted alkanes having at least one fluorine atom in their molecules such as trichlorofluoromethane, dichlorodifluoromethane dichloromonofluoromethanc, chlorodifluoromethane, dichlorotetrafluoroethane. In using these blowing agents, they are uniformly distributed in either the polyol reactant or the polyisocyanate reactant whereupon the reactants are mixed permitting the temperature of the mixture to rise during the ensuing reaction above the boiling point of the liquefied gas so as to produce a porous polyurethane. It should be noted that foaming may also be affected by combining the use of a flowing agent with the addition of water to the polyol.

Having generally described the invention, the following examples are given for purposes of illustration. It will be understood that the invention is not limited to these examples but is susceptible to different modifications that will be recognized by one of ordinary skill in the art.

[EXAMPLE 1 -A three-necked flask equipped with a mechanical stirrer, thermometer, and condenser is charged with 545 g. (4.4 moles of trimethyl phosphite, 536 g. (4.0 moles) of dipropylene glycol (1.0 mole) and 1.0 g. of sodium methoxide. The reactants are then heated to C. under a nitrogen gas atmosphere over a period of 5 hours during which time g. of methanol is collected. The reaction is completed under aspirator pressure for an additional 2 hours. Then, 250 g. benzene followed by 582 g. (4.0 moles) of 1,2,3-trichloropropene is added to the reaction mixture and heated for 12 hours to a temperature of 113 C. After removal of the volatile components, 849 g. of a viscous colorless oil product are obtained.

Analysis: Acid number 0.28 mg. KO'I-I/g; OH number 19 mg. KO'H/g; and percent P 10.8.

Infrared analysis shows a multiplet centered at 1600 cm.-

9 EXAMPLE 2 A three-necked flask equipped with a mechanical stirrer, thermometer, and condenser is charged with 134 g. (1 mole) of dipropylene glycol, 124 g. (1 mole) trimethyl phosphite and 0.3 g. of sodium methoxide. The reactants are heated to 100 C. in a N atmosphere for 4 hours while removing methanol. The reaction is completed under aspirator pressure for an additional 3 hours. Finally, 100 g. (1.3 moles) of allyl chloride is introduced to the reaction mixture and heated to a reflux temperature of 65 C. for 2 days. The excess and unreacted allyl chloride is then removed followed by the removal of the remaining volatiles at 140 C. under aspirator pressure to leave 183 g. of the liquid oily product.

Analysis: Acidity neutral; OH number KOH/g.; and percent P 13.5.

Infrared analysis of the product indicates a band at 1645 cm'- EXAMPLE 3 A three-necked 3 liter flask equipped with a mechanical stirrer, thermometer, a distilling head is charged with 545 g. (4.4 moles) trimethyl phosphite, 536 g. (4 moles) dipropylene glycol and 1.0 g. of sodium methoxide. These reactants are then heated to between 100-110 C. for 2 hours during which time 248 g. of methanol is distilled out. This initial reaction is completed by continued heating at 100 C. under aspirator pressure for an additional 3 hours. 500 g. (4 moles) of 3,4-dichlorobutene-1 is introduced to the reaction product and heated at 120 C. for 20 hours. After removal of the volatile components 626 g. of final product is obtained.

Analysis: Acid number 0.56 mg. KOH/g. sample; OH number 12 mg. KOH/g.; and percent P 13.4.

Infrared analysis shows band at 1630 cm..

EXAMPLE 4 A three-necked 500 ml. flask equipped with a mechanical stirrer, thermometer, and condenser is charged with 100 grams (0.52 mole) of the reaction product of dipropylene glycol and trimethylphosphite in a l to 1.1 mole ratio respectively. 65 grams (0.34 mole) of benzyl chloride is added to the flask and the resulting mixture is heated to about 110 to 115 C. over a period of 3.5 hours. The volatiles are removed at 105 C. under reduced pressure and 110 grams of slightly cloudy colorless liquid product are obtained.

Analysis: Acid number neutral.

In like manner to the above examples, good results are obtained when tripropylene glycol is substituted for the dipropylene glycol as well as when allyl bromide i substituted for the allyl chloride in Examples 1 and 2.

EXAMPLE 5 Fexible polyurethane foams are prepared by employing the following formulations:

Pro erties:

ise-tirne, seconds 130 Color-forming tendency Good Density, 1bs./it.= 1. 62 Flammability, ASTMD 1692.-

Burn extent, inches 3. 4 2.

Extinguishment time seconds.- 48 34 Dry heat (22 hours at 140 C.):

Flammability Burn extent, inches 3. 1 1. 1

Extinguishment time, seconds 1 Self-extinguishing:

wherein R is polyalkylene glycol residue defined as that portion remaining after two hydroxyl groups have been removed from a glycol having the formula:

wherein R is an alkylene group of from 2 to about 20 carbon atoms, which is straight chain, branch chain, or a mixture thereof, and X designates the number of repeating alkylene ether units and is from 2 to about 20; R is a C -C alkyl residue; R is an allylic residue formed from a compound selected from the group consisting of allyl bromide, allyl chloride, 3,4-dichlorobutene-1, 1,2,3- trichloropropene and 1,4-dichlorobutene-2; m is a number in the range from 0 to about 25; and n is a number in the range from 1 to about 25 with the proviso that the sum of m-+n is in the range of from about 2 to about 5 0.

2. The polyphosphorus composition of Claim 1 wherein R is a residue, as defined in Claim 1, of a polyalkylene glycol selected from the group consisting of diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, tributylene glycol and trihexylene glycol.

3. The polyphosphorus composition of claim 1 wherein m is 0.

4. The poyphosphorus composition of Claim 1 wherein R is a residue, as defined in Claim 1, of a polyalkylene glycol selected from the group consisting of diethylene glycol, dipropylene glycol and tripropylene glycol; R is methyl and R is selected from the group consisting of.

5. The polyphosphorus composition of Claim 1 wherein R is a residue, as defined in Claim 1, of dipropylene glycol, R is methyl, and R is 6. The polyphosphorus composition of Claim 1 wherein R is a residue, as defined in Claim 1, of dipropylene glycol, R is methyl, R is H2 1% C=CHz and m is 0.

References Cited UNITED STATES PATENTS 3,578,731 5/1971 Mange et a1 260929 3,159,605 12/ 1964 Friedman 260929 X ANTON H. SUTTO, Primary Examiner U.S. Cl. X.R.

Po-wii UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION- Patent 3,840,622 Dated OCEZODE'I' 8, 197

Inventor-(s) Kvung S shim It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Col. 1, line 17, change "stoichometr'ic" to -stoichiometric; Col. 2 line 10, insert --z"lameafter "described"; Col. 3, F Pmula (II) change "HO-(RO"+;-H" to -HOQ2"O% H- Col. 3, Formula (III) change 0R n n l 9R HORO P-OR mm H to -.-HOP.O P-ORO H Col. 3, line 40, change "art" to are Col. 3, line 66, change "di" to "di,--;

Col. 7, line 28, change "4,4'dimethylene-bis (phenylisocyanate) to 4,4'methylene-bis (phenylisocyanate); I

Col. 8, line 31, change "copolymehized: to --copolymerized and change "dimethoxpyole'thylene" to --dimethoxypolyethylene-;

Col. 9, line 55, change "E'exible" to -Flexible-;

Col. 10, line 39, change "poyphosphorus" to -polyphosphorus; Col. 10, lines 44 46, change 1 I I '"HZC C"'C CH2" to Y I I --H CCC CH2 C1 Signed and sealed this 27th day of May 1975.

(SEAL) attest:

C. MARSHALL DANN RUTH C. MASON Commissioner of Patents Attesting Officer and Trademarks PM mam STATES PATENT OFFICE (5/635 w-a- T *"m I n V LLELRTJIFILATE @E CQRREQTIQN Patent No. 3 2 Datea November 11, 1971 lnventofls) m Kyuncr S Shim 4 E It: is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected. as shown below:

g I A 1 Col. line 17, change "s toichometr'ic" to --stoichiometric;

Col. 2 line 10 insert --flame-- after "described";

RIIO H Col. 3, Formula (I), change "HO{RO":H" to -410- Col. Formula (III) change OR,

II II 1 ca, v HOBO P-ORF H to @EHO'RO P-ORO I H g I'M-n V Col. 3, line 40, change "art" to -are Y Col. 3, line 66, change "c1i" to "di,-;

Col. 7, line 28, change -"4,4-dimethylene-bis (phenylisocyanate) to 4,4methylenebis (phenylisocyanate) i .Col. 8, line 31, change "copolymehized: to copolymerized and change dimethoxpyolethylene" to -dimethoxypolyethylene; Col. 9, line 55, change "Fexible" to --Flexible Col. 10, line 39, change "poyphosphorus" to -polyphosphorus Col. 10, lines 44 46, change I "H2CCC CH2" to Signed and sealed this 18th day-of February'197 5.

a (SEAL) v J Attest:

- C, MARSHALL DANN RJJTH C. MASON Commissioner of Patents Attescing Officer and Trademarks 

1. A POLYPHOSPHORUS COMPOSITION CHARACTERIZED BY AN OH NUMBER BELOW ABOUT 160, AND HAVING THE FORMULA: 